I've been dealing with a knee injury since a softball, then gym accident 16 years ago. My knee can throb mercilessly while sitting (and especially driving), yet I can train and run marathons, including weight training, ski machine, and cycling, with little to no pain. I'd love to hear a good medical explanation as well.

honkygrass, weird. glad you can run. i ran three miles today. i thought i felt the knee a bit but it's very sore while sitting at the computer right now...not sure if it will tolerate more regular running...

moldyjello, i had a knee injury due to a marathon, November 2012. i thought it was ITBS. I had an ortho who thought it could be a minor LCL tear. My PTs never were able to diagnose it. It now seems more like patellar tendonosis and/or runner's knee...

How old are you? I've also been diagnosed with onset ostio arthritis. Also, do you do any stretching and rolling? I've had some interesting occasions during stretching, when my knee will pop, and the pain is significantly reduced. Religious stretching and rolling has really helped.

I'm 40. Certainly arthritis is a concern, but I think the main issue right now is the patellar tendon. It's tender at the attachments to shin and patella. I think there's minor swelling under the kneecap too. I guess there's a bursa there, so that may be irritated...

This injury may have been caused compensating for the ITBS over the winter...

I haven't ramped up my running for awhile, so we'll see how the knee handles that.